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哥伦布高架桥位于美国30号公路上,主桥为钢管混凝土系杆拱桥,拱肋采用钢管混凝土结构(拱肋间未设横撑),系杆采用预应力钢箱混凝土结构。为了解桥梁结构的受力性能,利用有限元软件建立该桥三维模型,考虑钢管、钢箱与混凝土的相互约束作用,分析拱肋和系杆的受力状况以及拱肋和系杆联结处的应力分布状况,同时校核拱的局部屈曲、横向稳定性和面内屈曲。分析结果表明:该桥拱肋不会发生局部屈曲,内充混凝土的约束效应使钢管的抗压强度明显增加,拱肋和系杆的受力及预应力钢丝束的设置合理,拱肋和系杆联结处的最大应力小于极限强度,结构不会发生横向失稳和面内屈曲。该桥施工时利用旧桥桥面板未拆除部分作为2个拱肋的组装和架设平台,在完成该桥的一半施工后,拆除旧桥剩余部分,利用已建成的桥面板作为施工平台,施工速度快,且对铁路交通的干扰较小。
The Columbus Viaduct is located on U.S. Route 30, with the main bridge being a CFST tied arch bridge with CFST structures (no bracing between arch ribs) and prestressed steel box concrete structures. In order to understand the mechanical behavior of the bridge structure, the three-dimensional model of the bridge is established by using the finite element software. The interaction between the steel pipe, the steel box and the concrete is considered. The stress state of the arch rib and the tie rod, Stress distribution, while checking arch local buckling, lateral stability and in-plane buckling. The analysis results show that local buckling of the bridge arch does not occur, the confining effect of concrete filled with concrete significantly increases the compressive strength of the steel pipe, the stress of the arch rib and the tie rod and the prestressed steel wire bundle are reasonable, The maximum stress at the rod joint is less than the ultimate strength, and the structure will not experience lateral buckling and in-plane buckling. The bridge construction using the unopened part of the old bridge deck as the two arch rib assembly and erection of the platform to complete the construction of the bridge in half, remove the remaining part of the old bridge, the use of the bridge deck has been built as a construction platform, the construction speed Fast and less disruptive to rail traffic.